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"use client";

import Link from "next/link";
import { useAuthStore, useConfigStore } from "@/lib/store";
import { useRouter } from "next/navigation";
import { useEffect, useState } from "react";
import { api } from "@/lib/api";

export default function ClientLayout({ children }: { children: React.ReactNode }) {
  const { user, logout } = useAuthStore();
  const { uiConfig, setUiConfig } = useConfigStore();
  const router = useRouter();
  const [isInitializing, setIsInitializing] = useState(true);
  const [dropdownOpen, setDropdownOpen] = useState(false);
  const { setAuth, token } = useAuthStore();

  useEffect(() => {
    let isMounted = true;
    
    const initApp = async () => {
      try {
        const configPromise = api.get('/api/config/ui').catch(e => {
          console.error('Failed to fetch UI config:', e);
          return null;
        });

        const authPromise = (async () => {
          const storedToken = localStorage.getItem('token');
          if (storedToken && !user) {
            try {
              const res = await api.get('/api/auth/profile');
              if (res.success && isMounted) {
                setAuth(res.data, storedToken);
              }
            } catch (err) {
              console.error('Failed to restore auth:', err);
              localStorage.removeItem('token');
            }
          }
        })();

        const [configRes] = await Promise.all([configPromise, authPromise]);

        if (isMounted && configRes && configRes.success && configRes.data) {
          setUiConfig(configRes.data);
        }
      } finally {
        if (isMounted) {
          setIsInitializing(false);
        }
      }
    };

    if (!uiConfig?.siteName || !user) {
      initApp();
    } else {
      setIsInitializing(false);
    }

    return () => {
      isMounted = false;
    };
  }, [setUiConfig, setAuth, uiConfig?.siteName, user]);

  const handleLogout = () => {
    logout();
    router.push('/');
  };

  const handleUpgradeVip = async () => {
    try {
      const res = await api.post('/api/orders/create', { isVip: true });
      if (res.success) {
        router.push(`/payment/${res.data.orderId}`);
      }
    } catch (err) {
      console.error(err);
      alert('创建会员订单失败,请稍后重试');
    }
  };

  const getAvatarColor = (name: string) => {
    let hash = 0;
    for (let i = 0; i < name.length; i++) {
      hash = name.charCodeAt(i) + ((hash << 5) - hash);
    }
    const hue = Math.abs(hash % 360);
    return `hsl(${hue}, 70%, 50%)`;
  };

  if (isInitializing) {
    return (
      <div className="min-h-screen flex items-center justify-center bg-gray-50">
        <div className="flex flex-col items-center gap-3">
          <div className="w-8 h-8 border-4 border-blue-600 border-t-transparent rounded-full animate-spin"></div>
          <p className="text-gray-500 font-medium">应用加载中...</p>
        </div>
      </div>
    );
  }

  const siteName = uiConfig?.siteName || '极简AI';
  const footerText = uiConfig?.footerText || ${new Date().getFullYear()} 极简AI. 保留所有权利。`;
  const navLinks = uiConfig?.navLinks || [];

  return (
    <>
      <header className="bg-white border-b sticky top-0 z-50">
        <div className="max-w-7xl mx-auto px-4 h-16 flex items-center justify-between">
          <Link href="/" className="text-xl font-bold text-blue-600">
            {uiConfig?.logo ? (
              // eslint-disable-next-line @next/next/no-img-element
              <img src={uiConfig.logo} alt={siteName} className="h-8 object-contain" />
            ) : (
              siteName
            )}
          </Link>
          <nav className="flex items-center gap-6">
            <Link href="/" className="text-gray-600 hover:text-blue-600 font-medium">首页</Link>
            {navLinks.map((link, idx) => (
              <Link 
                key={idx} 
                href={`/?category=${link.value}`} 
                className="text-gray-600 hover:text-blue-600 font-medium"
              >
                {link.label}
              </Link>
            ))}
            
            {user ? (
              <>
                {user.role !== 'admin' && (
                  <>
                    <Link href="/user/stars" className="text-gray-600 hover:text-blue-600 font-medium">我的收藏</Link>
                    <Link href="/user/courses" className="text-gray-600 hover:text-blue-600 font-medium">我的学习</Link>
                  </>
                )}
                {user.role === 'admin' && (
                  <Link href="/admin" className="text-gray-600 hover:text-blue-600 font-medium">管理后台</Link>
                )}
                <div className="relative border-l pl-6 ml-2">
                  <div 
                    className="w-10 h-10 rounded-full flex items-center justify-center text-white font-bold cursor-pointer hover:opacity-90 transition-opacity select-none relative"
                    style={{ backgroundColor: getAvatarColor(user.nickname) }}
                    onClick={() => setDropdownOpen(!dropdownOpen)}
                  >
                    {user.nickname.charAt(0).toUpperCase()}
                    {user.isVip && (
                      <div className="absolute -bottom-1 -right-1 bg-yellow-400 text-xs text-white px-1.5 rounded-full border-2 border-white shadow-sm font-bold scale-75">
                        VIP
                      </div>
                    )}
                  </div>

                  {dropdownOpen && (
                    <>
                      <div 
                        className="fixed inset-0 z-40" 
                        onClick={() => setDropdownOpen(false)}
                      ></div>
                      <div className="absolute right-0 mt-3 w-48 bg-white rounded-xl shadow-lg border border-gray-100 py-2 z-50 overflow-hidden">
                        <div className="px-4 py-2 border-b border-gray-50 mb-1">
                          <div className="text-sm font-medium text-gray-900 truncate">{user.nickname}</div>
                          <div className="text-xs text-gray-500 truncate">{user.email}</div>
                        </div>
                        
                        {!user.isVip && (
                          <button 
                            onClick={() => {
                              setDropdownOpen(false);
                              handleUpgradeVip();
                            }}
                            className="w-full text-left px-4 py-2.5 text-sm text-yellow-600 hover:bg-yellow-50 font-medium flex items-center transition-colors"
                          >
                            <span className="mr-2">👑</span>
                            注册会员 (¥{uiConfig?.memberFee ?? 99})
                          </button>
                        )}
                        
                        <button 
                          onClick={() => {
                            setDropdownOpen(false);
                            handleLogout();
                          }}
                          className="w-full text-left px-4 py-2.5 text-sm text-gray-600 hover:bg-gray-50 transition-colors"
                        >
                          退出登录
                        </button>
                      </div>
                    </>
                  )}
                </div>
              </>
            ) : (
              <Link href="/login" className="px-5 py-2.5 bg-blue-600 text-white rounded-lg hover:bg-blue-700 transition-colors font-medium text-sm">
                登录 / 注册
              </Link>
            )}
          </nav>
        </div>
      </header>
      
      <main className="flex-1 max-w-7xl mx-auto w-full px-4 py-8">
        {children}
      </main>

      <footer className="bg-white border-t py-8 mt-auto">
        <div className="max-w-7xl mx-auto px-4 text-center text-gray-500 text-sm">
          {footerText}
        </div>
      </footer>
    </>
  );
}